What's on the Bill (€134.48) is the amount that you would have paid if you had paid it on the day you received the bill (we calculate this automatically using the exchange rate on that day). So when you paid €136.98, we use the value you actually paid against what you would have paid on the day the bill was issued (€134.48), and we calculate the foreign exchange gain/loss using those 2 figures. In this case, you had a foreign exchange loss of €2.50 (136.98 - 134.48).